151531540 has 48 divisors (see below), whose sum is σ = 340284672. Its totient is φ = 56480256.

The previous prime is 151531519. The next prime is 151531577. The reversal of 151531540 is 45135151.

It is a happy number.

It is a super-2 number, since 2×151531540² = 45923615229543200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32857 + ... + 37183.

It is an arithmetic number, because the mean of its divisors is an integer number (7089264).

Almost surely, 2^151531540 is an apocalyptic number.

151531540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 151531540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170142336).

151531540 is an abundant number, since it is smaller than the sum of its proper divisors (188753132).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

151531540 is a wasteful number, since it uses less digits than its factorization.

151531540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4456 (or 4454 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 151531540 is about 12309.8147833345. The cubic root of 151531540 is about 533.1315026234.

Adding to 151531540 its reverse (45135151), we get a palindrome (196666691).

The spelling of 151531540 in words is "one hundred fifty-one million, five hundred thirty-one thousand, five hundred forty".